基于φ-OTDR的架空输电线路风振检测系统设计

Design of the wind-vibration detection system for overhead power line based on φ-OTDR

针对处于野外环境下的架空输电线路容易受风振动而造成线路损坏,严重时发生大面积停电事故,直接造成经济的巨大损失问题,为准确地掌握线路的振动状态与疲劳程度,提供电力系统的安全运行以实时预警服务,设计一套基于'FPGA+ARM'的分布式光纤传感监测系统。基于输电线路通信光纤OPGW,采用了相位敏感光时域反射计(φ-OTDR)和卡门旋涡理论实现对长距离输电线路受风振动及风速的在线监测,并同时运用累加平均算法以提高传感微弱信号的信噪比,结合上位机监控显示程序界面,实现了线路风振监测系统的搭建。实验测试结果表明,传感系统工作稳定,风振识别及定位准确,能很好地满足实际要求。

Aiming at the problem that overhead power lines in the wild were vulnerable to wind vibration and great economic loss could be triggered with large area blackout accident when circuit damage happens,to accurately sense the line disturbance and fatigue level and provide the safe operation of power system with real-time warning,a distributed optical fiber sensor system based on FPGA+ARM was carried out.On the basis of power communication optical fiber OPGW,the phase-sensitive optical time-domain reflectometer(φ-OTDR)and Carmen vortex theory were used to realize on-line monitoring of long-distance transmission lines about wind vibration and wind speed.Meanwhile,the accumulative average algorithm was employed to improve the signal-to-noise ratio of the weak sensor signal and the wind vibration monitoring system was built with the upper computer monitoring interface.The testing results show that the system works stably,the wind vibration identification and positioning are accurate,and can well meet the actual requirements.